K. Siorpaes, и M. Hepp. Proceedings of the 5th European semantic web conference on The semantic web: research and applications, стр. 751--766. Berlin, Heidelberg, Springer-Verlag, (2008)
X. Wu, L. Zhang, и Y. Yu. WWW '06: Proceedings of the 15th international conference on World Wide Web, стр. 417--426. New York, NY, USA, ACM Press, (2006)